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With an object created by QScriptEngine::newObject(), it should
be possible to call QScriptValue::setClass() to dynamically
change the behavior of that object. Similarly, it should be
possible to promote plain script objects to QObject (QVariant)
wrappers by calling the overload of QScriptEngine::newQObject()
(newVariant()) that takes a script object as the first argument.
This commit implements this capability.
The premise is the (internal) QScriptObject class, which inherits
JSC::JSObject. It reimplements all the methods for getting/setting
properties etc. Then there's a level of indirection to facilitate
dynamic change of the class: Each QScriptObject can have a
delegate associated with it that will handle operations on the
object. By default there is no delegate, so the object behaves as
a normal JS object, as you expect. However, once a delegate is set
(e.g., when QScriptValue::setScriptClass() is called),
QScriptObject will give the delegate the chance to handle the
object operation.
In addition to a delegate implementation for QScriptClass-based
objects, there are also delegates for QObject and QVariant
wrappers. These replace the QObjectWrapperObject and
QVariantWrapperObject classes.
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(QScriptValue::objectId() and QScriptEnigne::objectById)
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Do it The right way(TM), by lazily wrapping JSC::ExecState objects.
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It's possible that JSC evaluate() returns a completion of type
Throw without hadException() being true, so we need to store the
exception value explicitly.
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Callable seems to work, HasInstance not quite there yet.
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Enumeration is missing, as is the ability to change the class
of an object after it has been created.
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Not fully working yet, so disabled for now
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Not everything passes but at least nothing asserts anymore, so
the test runs to completion.
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